WebNov 4, 2024 · The obtained chiral polymers have high porosity, excellent stability and tailorable catalytic centers, and display excellent activity, enantioselectivity and recyclability for asymmetric transfer hydrogenation. This article is part of the themed collection: Journal of Materials Chemistry A HOT Papers WebApr 12, 2024 · We have developed a chiral phosphoric acid-catalyzed enantioselective Friedel–Crafts alkylation reaction between pyrroles and indolylmethanols. Wide substrate scope was observed, and a chiral all-carbon quaternary center was constructed at the 3 …
Asymmetric Spirocyclization Enabled by Iridium and Brønsted Acid ...
WebJun 9, 2015 · In a collaborative effort with the Jacobsen laboratory, this synthetic transformation was implemented into its catalytic enantioselective version, wherein the combination of chiral thiourea 21 and achiral Brønsted acid (BzOH) catalysts promotes enantioselective additions of 3-substitued indoles to a pyrone-derived o-QM . Whereas … WebJul 1, 2024 · A new bowl-shaped phosphoric acid bearing an o -CF 3 -aryl on the H 8 -BINOL-framework OCF -CPA (CPA18) has been developed as an effective, multipoint-controlled chiral catalyst for the reaction. And mechanistic investigations reveal the presence of crucial C–H⋯F hydrogen bonding in the enantiodetermining transition … 馬 美しい画像
Enantioselective Synthesis of an All-Carbon Quaternary …
Web1 day ago · Chiral Brønsted acid-catalyzed asymmetric intermolecular [4 + 2] annulation of ynamides with para-quinone methides @TotalSynthesis @OrgSynth #asymetrical … WebDespite recent advancements in the development of catalytic asymmetric electrophile induced lactonization reactions of olefinic carboxylic acids, the archetypical hydrolactonization has long remained an unsolved and well-recognized challenge. Here, we report the realization of a catalytic asymmetric hydrolactonization using a confined … WebMar 23, 2009 · A new chiral phosphoric acid, derived from 3,3'-diphenyl-H8-binol, exhibited superior catalytic activity and enantioselectivity compared to its structural analogues, affording high enantiOSElectivities ranging from 85 to 97% ee with a wide scope of substrates. 257 PDF 馬 美味しい料理